Built '65 series 300c.i. (around 312c.i. now) I-6 w/ 300 H.P. @ 4600 rpm & 400 F.T.P. @ 3200 rpm w/ a 9.5-1 C.R.
It idels @ 675 & is smooth as glass, a quarter was placed on top of the Valve Cover & it Did Not move Nor rattle @ least on the stand anyway.Ross Pistons 4.060
Hastings Power Flex...